Hot blast cooking attachment for heating stoves



y 1939- J. A. UNDERWOOD 2,159,576

HOT BLAST COOKING ATTAQBIBNT FOR HEATING STOVES Filed June 27, 1936 Patented May 23, 1939 UNITED STATES PATENT OFFICE HOT BLAST COOKING ATTACHMENT FOR HEATING STOVES Application June 27, 1936, Serial No. 87,672

4 Claims.

The present invention is related to hot-blast cooking attachments for heating stoves.

Its primary object is to provide an attachment of the character mentioned by which light cooking can be done on a heating stove, making it possible to provide a tempered adjustable heat, and to vary the degree thereof in accordance with the requirements to be met.

A further object of the invention is to provide such an attachment by the use of which a supply of air may be admitted over the top of the burning fire within the heater, and thus supply the requisite oxygen to intensify combustion, consume escaping gases that ordinarily form smoke, and attain more heat from the fuel consumed.

A further object sought'to be attained is the provision of an attachment of the nature referred to which is of simple construction and easily assembled in operative position in the stove with which it is to be used, thus enabling the same to be produced and applied at relatively low cost and without the use of skilled labor.

Other objects will be apparent as the character of the improvements is better understood, the invention consisting substantially in the novel construction, combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawing, and finally pointed out in the appended claims.

While the form of the invention herein shown and described is believed to be a preferred embodiment thereof, it is to be understood that the invention is susceptible to change, modification and variation, and the present disclosure, therefore, 5 is to be considered from the illustrative standpoint and not as imposing restriction or limitation on the invention.

In the drawing:

Fig. 1 is a front elevation of a heating stove, parts being broken away, equipped with a hotblast cooking attachment embodying the present invention.

Fig, 2 is a transverse sectional view, on an enlarged scale, of the herein described cooking attachment, as on the line 2-2, Fig. 3.

Fig. 3 is a top plan view of the attachment.

Fig, 4 is a sectional plan view, as on the line 4-4, Fig. 2.

Referring now in detail'to the accompanying drawing, the numeral designates a heating stove, generally of the radiant type, and including a heating drum H and an enclosing shell I2.

The dome l3 of the drum I l is provided with a centrally disposed opening it which accommoand the latter includes a hollow body l5, which is generally circular in its outline or external configuration.

The body l5 has a depending dished supporting collar N5 of such diameter as to fit the opening l4, and Within the opening ll of said-collar is disposed a downwardly extending hot-blast tube 18. As seen in Fig. 1, the length of the tube I8 is sufficient so as to position its lower end within the combustion chamber of the stove or heater, and in such proximity to the body of the fuel therein as to discharge air Within the combustion zone. The upper end of the hot-blast tube l8 has an outwardly-flared flange [9 which is loosely supported at the inside of the dished collar I6. The flange l9 affords the sole means of support of the hot-blast tube l8 from the collar l6.

Immediately adjacent to the dished collar l8 there is formed an annular shoulder 20, which shoulder seats upon the upper surface of the dome l3 so as to position the body 15 in proper relation to the opening M for the fitting of the collar 16 within that opening, The body I5 likewise is provided with an annular flange 2| which is designed to contact the dome l3, and thereby support the outer edge of the body IS on said dome.

That the body l5 may be properly fastened to the dome I3 so as to provide fixed positioning of the body on the dome, the body l5 has a series of diametrically disposed fillets 22, each of which is perforated so as to receive a stove bolt 23. These bolts are threaded into engagement with the dome I3, and there provide for rigidly mounting the body IE on the dome.

The bottom 24 of the body 15 is provided with an upwardly flared recess 25 which affords a supporting ledge 26 that surrounds the top edges of the dished collar Hi, this ledge being complemental to the shoulder 20.

Within the flared recess 25 is arranged an air controlling damper 21 comprising a lower disk 28 and an upper disk 29. These disks are provided with openings 30 for passage of air, the openings of each disk corresponding in size and shape to the openings of the other, and being designed either to register with each other as to their full dimensions, or merely to overlap, and thereby vary the size of the openings to control the amount of air flowing therethrough. The lower disk 28 is of greater diameter than the upper disk 29, and the edge of the said disk 28 is beveled so as to lit the flaring wall of the recess 25,

.The air-controlling damper 21 is loosely received by the recess 26, and may be readily fitted to said recess or removed therefrom.

For permitting relative movement between the disks 28 and 29, a pivot pin 3|, in the form of a bolt, is threaded into engagement with the lower disk 28 and loosely passes through the upper disk 29. A coil spring 32 surrounds the pivot pin 3| and is fitted between the head thereof and the upper surface of the upper disk 29. Thus the disk 29 is yieldingly held against the disk 28.

For operating the disk 29 so as to rotate the same relatively to the disk 28, the former is-provided with an upstanding stud 33 to which is attached a laterally disposed connecting rod 34 which extends through an opening 35 in the body l to a point for convenient access and application of the hand when it is desired to shift the disk 29 in relation to the disk 28, and thereby to vary the degree of registry of the openings 30 of the disk 29 with respect to the openings 30 of the disk 28.

It is desirable that the degree of movement of the upper disk 29 shall be limited in both directions of its rotation, whereby either to place the openings 30 of that disk and the lower disk 28 in full register or completely out of register with each other, and to the accomplishment of this end the bottom of the body I5 is provided with an arcuate recess 36, which recess is located in the general horizontal plane of the disk 29, and opens inwardly, or towards said disk. The disk 29 has a stop lug 31 which projects from its periphery and lies within the recess 36. This stop lug 31 is designed to engage either end of the recess 36, and in such positions the openings 30 of the two disks lie either in full register with each other, or out of complete register, thus controlling the flow of air through the openings 30 downwardly into the hot-blast tube I8. It is manifest, of course, that at intermediate points between the two limits of movement of the stop lug 31 the degree to which the openings 30 of the upper disk 29 will register with the openings 30 of the lower disk 28 will vary, thereby permitting the amount of air flowing through the openings to be varied.

The top of the body l5 has an upwardly flaring recess 38, and within this recess is seated a removable lid 39 which is provided with a plurality of openings 48 whereby air may enter the interior of the body l5. This lid 39 has a plurality of depending arcuate supporting flanges 4| designed to rest upon an annular shoulder 42 which is formed at the bottom of the flared recess 38. Thus the lid 39 is sustained in position within the body I 5 with its upper surface flush with the edges of the recess 38. By reason of the support of the lid 39 by the shoulder 42 the lid 39 is maintained relatively high above the air damper 21 so as to provide a relatively large space between the lid 39 and said damper.

In the use of the herein described attachment, it is obvious that the body l5 and its appurtenant parts are sustained by the dome l3, and lie within the shell l2 of the stove. The shell l2, usually having its top in the form of grill work, permits the free passage of air to and from the heating drum ll. Cold air will enter the top of the shell and pass through the openings 40 of the lid 39. If the openings 30 of the two disks 28 and 29 are in communication, the air will pass; down through the hot-blast tube l8 and be discharged within the combustion chamber and the fire pot. It will there supply oxygen to the fire to intensify combustion and assist in more complete con.-

sumption of escaping gases, so that more heat is obtained from the fuel consumed, and the heating capacity of the stove increased. Obviously, the flow of the air will be varied by the relative adjustment of the disk 29 with reference to the disk 28 to vary the degree of communication between the openings 38, and this is effected by manipulating the operating lever 34 which is conveniently accessible at the exterior of the stove.

The lid 39 serves also as an anti-scorch cooking lid, making it possible to cook cereal, warm milk and do other light cooking when appropriate receptacles are seated upon the lid. As illustrated in Fig. 1, this may be effected by providing the shell [2 with a hinged door 33, which closes an opening in the top of the shell l2 and which, when raised, will permit cooking utensils to be passed through the shell l2 and be seated upon the lid 39.

Because of the air space between the lid 39 and the air damper 21, and the effective control of the air flowing downwardly through the air chamber and the hot-blast tube I 8, the degree of heat may be controlled so as to avoid burning of the contents of the cooking utensils, such control being effected by either increasing the air supply so as to promote combustion, and thereby increase the degree of heat, or curtailing the air supply, and thus reducing the degree of heat.

I claim: I

1. An attachment of the class described, comprising a chambered body member adapted for association with the heating drum of a stove, a supporting member carried by the chambered body member, a hot-blast tube depending from and sustained by the supporting member, an aircontrolling damper within the chambered body member and controlling communication between said body member and the hot-blast tube, means for actuating said air-controlling damper, and a displaceable lid associated with said chambered body member and having means for admitting air to the interior of said body member.

2. An attachment of the class described, comprising a chambered bodymember adapted for association with the heating drum of a stove, a supporting member carried by the chambered body member, a hot-blast tube depending from and sustained by the supporting member, an air-controlling damper within the chambered body member and including a pair of perforated disks capable of relative movement with respect to each other, means for imparting such relative movement to said disks, said damper controlling communication between said body member and the hot-blast tube, and a displaceable perforated lid seated within the chambered body member and affording flow of air therethrough to the chambered body member and the hot-blast tube controlled by the action of said air damper.

3. An attachment of the class described, comprising a chambered body member adapted for association with the heating drum of a stove, a depending dished supporting member carried by the chambered body member and provided with an opening, an external shoulder surrounding the supporting member and seating upon the heating drum to sustain the body member on said drum, a hot-blast tube arranged in the opening of the supporting member and having a flared end seated upon the interior of the supporting member, the chambered member having an internal annular seat adjacent to said supporting member, an air-controlling damper within the chambered body portion and displaceably mounted on said internal annular seat, said air damper controlling communication between said body member and the hot-blast tube, means for actuating said air-controlling damper, an internal annular shoulder arranged within the chambered body adjacent its top, and a displaceable perforated lid seated upon the last-mentioned shoulder and affording flow of air therethrough to the chambered body member and the hot-blast tube controlled by the action of said air damper.

4. An attachment of the class described, comprising a chambered body member adapted for association with the heating drum of a stove, a dished supporting member carried by the chambered body member and depending from the lower side of the latter, said supporting member having an opening in its bottom, an external shoulder surrounding the supporting member and seating upon the heating drum to sustain the body member on said drum, a hot-blast tube arranged in the opening of the supporting member and having a flared end seated upon the interior of the supporting member, the chambered member having an internal annular seat above said supporting member, an air-controlling damper Within the chambered body member and displaceably mounted on said internal annular seat above the hot-blast tube, said air-damper controlling communication between said body member and the hot-blast tube, means at the exterior of the body member and connected to said air-controlling damper for actuating the latter, an internal annular shoulder arranged at the top of the chambered body member, and a displaceable perforated lid seated upon the last mentioned shoulder and affording flow of air therethrough to the chambered body member and the hot-blast tube controlled by the action of said air-damper.

JOHN A. UNDERWOOD. 

